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<nowiki><pre>00000-00007: Header 1UJQ00_1
== File Header ==
00008-0000B: Number of pictures plus 1 (why?)
{| class="wikitable" border="1"
0000C-00011: Unknown value (seems to be static?) B80B01000000
|-
00012-00013: Total number of photos (excluding 2D dups)
! Offset
00014-00017: Appears to be file size. It's only 32 bits = 4GB max. A few hundred K
! Size
                larger than the actual size of every file in DCIM (?)
! Description
                1607971 vs DCIM/100NIN = 1441792 vs DCIM = 147560 vs files = 1409024
|-
                vs non-disk usage = 1224857
| 0x0
                phtcache non-disk = 456024, disk = 458752
| 0x8
                phtcache (non) + files (non) = 1680881 - 1607971 = 72910 = 72K hmm...
| Always "1UJQ00_1"
                maybe the 72910 is some kind of checksum?
|-
                ( I have no clue, all these notes were probably worthless)
| 0x8
00018-0001B: Preferred image file format. Should be MPO\x00 or JPG\x00. The inner cam is the only
| 0x4
                one that will yield JPG. 3D pictures are taken even with screen switched to 2D.
| Number of Pictures + 1
0001C-00023: Name of image
|-
00024-0002B: Subfolder of image
| 0xC
0002C-00033: Time taken based on "DS epoch" (start of 1/1/2000) (UNIX+946684800)
| 0x2
00034-00037: Time last viewed?
| Total number of photo entries(including unused entries) stored here, this is normally value 3000 (500 on NAND).
0003C-0003F: UNKNOWN
|-
00040-00043: UNKNOWN
| 0xE
00044-00045: UNKNOWN
| 0x2
00046-00047: UNKNOWN
| This u16 must be < 2, this is normally value 1 (0 for NAND).
00048-0004B: UNKNOWN
|-
00058-0005B: File size
| 0x10
| 0x2
| Unknown, normally value zero.
|-
| 0x12
| 0x2
| Total number of photos(used entries), excluding 2D dups.
|-
| 0x14
| 0x2
| CRC16 over the entire file with this CRC field set to zero when calculating the CRC, with initialval=0 and polynomial=0xA001.
|-
| 0x16
| 0x2
| Size of this header, must be >=0x18(this is always value 0x18).
|-
| 0x18
| 0x98 * Number of Pictures
| Pictures Property, index refereed by 3DS Camera
|}


</pre></nowiki>
The phtcache.bin actual filesize must be at least the following size: hdrsizefield + totalstoredentries*0x98.
 
== Pictures Property ==
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x04
| Null-terminated file extension: MPO, JPG, or AVI.
|-
| 0x4
| 0x8
| Image file name, without the extension.
|-
| 0xC
| 0x8
| Directory name under the DCIM directory.
|-
| 0x14
| 0x4
| Time taken based on "DS epoch" (start of 1/1/2000) (UNIX+946684800)
|-
| 0x1C
| 0x4
| Time last viewed?
|-
| 0x24
| 0x4
| ?
|-
| 0x28
| 0x4
| ?
|-
| 0x2C
| 0x4
| ?
|-
| 0x30
| 0x4
| ?
|-
| 0x34
| 0x4
| ?
|-
| 0x38
| 0x4
| ?
|-
| 0x3C
| 0x4
| ?
|-
| 0x40
| 0x4
| File size
|-
| 0x50
| 0x18*4
| 4 blocks, where each block is 0x18-bytes.
|}
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